/* System module *//*Various bits of information used by the interpreter are collected inmodule 'sys'.Function member:- exit(sts): raise SystemExitData members:- stdin, stdout, stderr: standard file objects- modules: the table of modules (dictionary)- path: module search path (list of strings)- argv: script arguments (list of strings)- ps1, ps2: optional primary and secondary prompts (strings)*/#include "Python.h"#include "compile.h"#include "frameobject.h"#include "eval.h"#include "osdefs.h"#ifdef MS_WINDOWS#define WIN32_LEAN_AND_MEAN#include "windows.h"#endif /* MS_WINDOWS */#ifdef MS_COREDLLexternvoid*PyWin_DLLhModule;/* A string loaded from the DLL at startup: */externconstchar*PyWin_DLLVersionString;#endif#ifdef __VMS#include <unixlib.h>#endif#ifdef MS_WINDOWS#include <windows.h>#endif#ifdef HAVE_LANGINFO_H#include <locale.h>#include <langinfo.h>#endifPyObject*PySys_GetObject(char*name){PyThreadState*tstate=PyThreadState_Get();PyObject*sd=tstate->interp->sysdict;if(sd==NULL)returnNULL;returnPyDict_GetItemString(sd,name);}FILE*PySys_GetFile(char*name,FILE*def){FILE*fp=NULL;PyObject*v=PySys_GetObject(name);if(v!=NULL&&PyFile_Check(v))fp=PyFile_AsFile(v);if(fp==NULL)fp=def;returnfp;}intPySys_SetObject(char*name,PyObject*v){PyThreadState*tstate=PyThreadState_Get();PyObject*sd=tstate->interp->sysdict;if(v==NULL){if(PyDict_GetItemString(sd,name)==NULL)return0;elsereturnPyDict_DelItemString(sd,name);}elsereturnPyDict_SetItemString(sd,name,v);}staticPyObject*sys_displayhook(PyObject*self,PyObject*o){PyObject*outf;PyInterpreterState*interp=PyThreadState_Get()->interp;PyObject*modules=interp->modules;PyObject*builtins=PyDict_GetItemString(modules,"__builtin__");if(builtins==NULL){PyErr_SetString(PyExc_RuntimeError,"lost __builtin__");returnNULL;}/* Print value except if None *//* After printing, also assign to '_' *//* Before, set '_' to None to avoid recursion */if(o==Py_None){Py_INCREF(Py_None);returnPy_None;}if(PyObject_SetAttrString(builtins,"_",Py_None)!=0)returnNULL;if(Py_FlushLine()!=0)returnNULL;outf=PySys_GetObject("stdout");if(outf==NULL){PyErr_SetString(PyExc_RuntimeError,"lost sys.stdout");returnNULL;}if(PyFile_WriteObject(o,outf,0)!=0)returnNULL;PyFile_SoftSpace(outf,1);if(Py_FlushLine()!=0)returnNULL;if(PyObject_SetAttrString(builtins,"_",o)!=0)returnNULL;Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(displayhook_doc,"displayhook(object) -> None\n""\n""Print an object to sys.stdout and also save it in __builtin__._\n");staticPyObject*sys_excepthook(PyObject*self,PyObject*args){PyObject*exc,*value,*tb;if(!PyArg_UnpackTuple(args,"excepthook",3,3,&exc,&value,&tb))returnNULL;PyErr_Display(exc,value,tb);Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(excepthook_doc,"excepthook(exctype, value, traceback) -> None\n""\n""Handle an exception by displaying it with a traceback on sys.stderr.\n");staticPyObject*sys_exc_info(PyObject*self,PyObject*noargs){PyThreadState*tstate;tstate=PyThreadState_Get();returnPy_BuildValue("(OOO)",tstate->exc_type!=NULL?tstate->exc_type:Py_None,tstate->exc_value!=NULL?tstate->exc_value:Py_None,tstate->exc_traceback!=NULL?tstate->exc_traceback:Py_None);}PyDoc_STRVAR(exc_info_doc,"exc_info() -> (type, value, traceback)\n\\n\Return information about the most recent exception caught by an except\n\clause in the current stack frame or in an older stack frame.");staticPyObject*sys_exc_clear(PyObject*self,PyObject*noargs){PyThreadState*tstate=PyThreadState_Get();PyObject*tmp_type,*tmp_value,*tmp_tb;tmp_type=tstate->exc_type;tmp_value=tstate->exc_value;tmp_tb=tstate->exc_traceback;tstate->exc_type=NULL;tstate->exc_value=NULL;tstate->exc_traceback=NULL;Py_XDECREF(tmp_type);Py_XDECREF(tmp_value);Py_XDECREF(tmp_tb);/* For b/w compatibility */PySys_SetObject("exc_type",Py_None);PySys_SetObject("exc_value",Py_None);PySys_SetObject("exc_traceback",Py_None);Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(exc_clear_doc,"exc_clear() -> None\n\\n\Clear global information on the current exception. Subsequent calls to\n\exc_info() will return (None,None,None) until another exception is raised\n\in the current thread or the execution stack returns to a frame where\n\another exception is being handled.");staticPyObject*sys_exit(PyObject*self,PyObject*args){PyObject*exit_code=0;if(!PyArg_ParseTuple(args,"|O:exit",&exit_code))returnNULL;/* Raise SystemExit so callers may catch it or clean up. */PyErr_SetObject(PyExc_SystemExit,exit_code);returnNULL;}PyDoc_STRVAR(exit_doc,"exit([status])\n\\n\Exit the interpreter by raising SystemExit(status).\n\If the status is omitted or None, it defaults to zero (i.e., success).\n\If the status is numeric, it will be used as the system exit status.\n\If it is another kind of object, it will be printed and the system\n\exit status will be one (i.e., failure).");#ifdef Py_USING_UNICODEstaticPyObject*sys_getdefaultencoding(PyObject*self){returnPyString_FromString(PyUnicode_GetDefaultEncoding());}PyDoc_STRVAR(getdefaultencoding_doc,"getdefaultencoding() -> string\n\\n\Return the current default string encoding used by the Unicode \n\implementation.");staticPyObject*sys_setdefaultencoding(PyObject*self,PyObject*args){char*encoding;if(!PyArg_ParseTuple(args,"s:setdefaultencoding",&encoding))returnNULL;if(PyUnicode_SetDefaultEncoding(encoding))returnNULL;Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(setdefaultencoding_doc,"setdefaultencoding(encoding)\n\\n\Set the current default string encoding used by the Unicode implementation.");staticPyObject*sys_getfilesystemencoding(PyObject*self){if(Py_FileSystemDefaultEncoding)returnPyString_FromString(Py_FileSystemDefaultEncoding);Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(getfilesystemencoding_doc,"getfilesystemencoding() -> string\n\\n\Return the encoding used to convert Unicode filenames in\n\operating system filenames.");#endif/* * Cached interned string objects used for calling the profile and * trace functions. Initialized by trace_init(). */staticPyObject*whatstrings[4]={NULL,NULL,NULL,NULL};staticinttrace_init(void){staticchar*whatnames[4]={"call","exception","line","return"};PyObject*name;inti;for(i=0;i<4;++i){if(whatstrings[i]==NULL){name=PyString_InternFromString(whatnames[i]);if(name==NULL)return-1;whatstrings[i]=name;}}return0;}staticPyObject*call_trampoline(PyThreadState*tstate,PyObject*callback,PyFrameObject*frame,intwhat,PyObject*arg){PyObject*args=PyTuple_New(3);PyObject*whatstr;PyObject*result;if(args==NULL)returnNULL;Py_INCREF(frame);whatstr=whatstrings[what];Py_INCREF(whatstr);if(arg==NULL)arg=Py_None;Py_INCREF(arg);PyTuple_SET_ITEM(args,0,(PyObject*)frame);PyTuple_SET_ITEM(args,1,whatstr);PyTuple_SET_ITEM(args,2,arg);/* call the Python-level function */PyFrame_FastToLocals(frame);result=PyEval_CallObject(callback,args);PyFrame_LocalsToFast(frame,1);if(result==NULL)PyTraceBack_Here(frame);/* cleanup */Py_DECREF(args);returnresult;}staticintprofile_trampoline(PyObject*self,PyFrameObject*frame,intwhat,PyObject*arg){PyThreadState*tstate=frame->f_tstate;PyObject*result;if(arg==NULL)arg=Py_None;result=call_trampoline(tstate,self,frame,what,arg);if(result==NULL){PyEval_SetProfile(NULL,NULL);return-1;}Py_DECREF(result);return0;}staticinttrace_trampoline(PyObject*self,PyFrameObject*frame,intwhat,PyObject*arg){PyThreadState*tstate=frame->f_tstate;PyObject*callback;PyObject*result;if(what==PyTrace_CALL)callback=self;elsecallback=frame->f_trace;if(callback==NULL)return0;result=call_trampoline(tstate,callback,frame,what,arg);if(result==NULL){PyEval_SetTrace(NULL,NULL);Py_XDECREF(frame->f_trace);frame->f_trace=NULL;return-1;}if(result!=Py_None){PyObject*temp=frame->f_trace;frame->f_trace=NULL;Py_XDECREF(temp);frame->f_trace=result;}else{Py_DECREF(result);}return0;}staticPyObject*sys_settrace(PyObject*self,PyObject*args){if(trace_init()==-1)returnNULL;if(args==Py_None)PyEval_SetTrace(NULL,NULL);elsePyEval_SetTrace(trace_trampoline,args);Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(settrace_doc,"settrace(function)\n\\n\Set the global debug tracing function. It will be called on each\n\function call. See the debugger chapter in the library manual.");staticPyObject*sys_setprofile(PyObject*self,PyObject*args){if(trace_init()==-1)returnNULL;if(args==Py_None)PyEval_SetProfile(NULL,NULL);elsePyEval_SetProfile(profile_trampoline,args);Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(setprofile_doc,"setprofile(function)\n\\n\Set the profiling function. It will be called on each function call\n\and return. See the profiler chapter in the library manual.");staticPyObject*sys_setcheckinterval(PyObject*self,PyObject*args){if(!PyArg_ParseTuple(args,"i:setcheckinterval",&_Py_CheckInterval))returnNULL;Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(setcheckinterval_doc,"setcheckinterval(n)\n\\n\Tell the Python interpreter to check for asynchronous events every\n\n instructions. This also affects how often thread switches occur.");staticPyObject*sys_getcheckinterval(PyObject*self,PyObject*args){returnPyInt_FromLong(_Py_CheckInterval);}PyDoc_STRVAR(getcheckinterval_doc,"getcheckinterval() -> current check interval; see setcheckinterval().");staticPyObject*sys_setrecursionlimit(PyObject*self,PyObject*args){intnew_limit;if(!PyArg_ParseTuple(args,"i:setrecursionlimit",&new_limit))returnNULL;if(new_limit<=0){PyErr_SetString(PyExc_ValueError,"recursion limit must be positive");returnNULL;}Py_SetRecursionLimit(new_limit);Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(setrecursionlimit_doc,"setrecursionlimit(n)\n\\n\Set the maximum depth of the Python interpreter stack to n. This\n\limit prevents infinite recursion from causing an overflow of the C\n\stack and crashing Python. The highest possible limit is platform-\n\dependent.");staticPyObject*sys_getrecursionlimit(PyObject*self){returnPyInt_FromLong(Py_GetRecursionLimit());}PyDoc_STRVAR(getrecursionlimit_doc,"getrecursionlimit()\n\\n\Return the current value of the recursion limit, the maximum depth\n\of the Python interpreter stack. This limit prevents infinite\n\recursion from causing an overflow of the C stack and crashing Python.");#ifdef MS_WINDOWSPyDoc_STRVAR(getwindowsversion_doc,"getwindowsversion()\n\\n\Return information about the running version of Windows.\n\The result is a tuple of (major, minor, build, platform, text)\n\All elements are numbers, except text which is a string.\n\Platform may be 0 for win32s, 1 for Windows 9x/ME, 2 for Windows NT/2000/XP\n\");staticPyObject*sys_getwindowsversion(PyObject*self){OSVERSIONINFOver;ver.dwOSVersionInfoSize=sizeof(ver);if(!GetVersionEx(&ver))returnPyErr_SetFromWindowsErr(0);returnPy_BuildValue("HHHHs",ver.dwMajorVersion,ver.dwMinorVersion,ver.dwBuildNumber,ver.dwPlatformId,ver.szCSDVersion);}#endif /* MS_WINDOWS */#ifdef HAVE_DLOPENstaticPyObject*sys_setdlopenflags(PyObject*self,PyObject*args){intnew_val;PyThreadState*tstate=PyThreadState_Get();if(!PyArg_ParseTuple(args,"i:setdlopenflags",&new_val))returnNULL;if(!tstate)returnNULL;tstate->interp->dlopenflags=new_val;Py_INCREF(Py_None);returnPy_None;}PyDoc_STRVAR(setdlopenflags_doc,"setdlopenflags(n) -> None\n\\n\Set the flags that will be used for dlopen() calls. Among other\n\things, this will enable a lazy resolving of symbols when importing\n\a module, if called as sys.setdlopenflags(0)\n\To share symbols across extension modules, call as\n\sys.setdlopenflags(dl.RTLD_NOW|dl.RTLD_GLOBAL)");staticPyObject*sys_getdlopenflags(PyObject*self,PyObject*args){PyThreadState*tstate=PyThreadState_Get();if(!tstate)returnNULL;returnPyInt_FromLong(tstate->interp->dlopenflags);}PyDoc_STRVAR(getdlopenflags_doc,"getdlopenflags() -> int\n\\n\Return the current value of the flags that are used for dlopen()\n\calls. The flag constants are defined in the dl module.");#endif#ifdef USE_MALLOPT/* Link with -lmalloc (or -lmpc) on an SGI */#include <malloc.h>staticPyObject*sys_mdebug(PyObject*self,PyObject*args){intflag;if(!PyArg_ParseTuple(args,"i:mdebug",&flag))returnNULL;mallopt(M_DEBUG,flag);Py_INCREF(Py_None);returnPy_None;}#endif /* USE_MALLOPT */staticPyObject*sys_getrefcount(PyObject*self,PyObject*arg){returnPyInt_FromLong(arg->ob_refcnt);}#ifdef Py_REF_DEBUGstaticPyObject*sys_gettotalrefcount(PyObject*self){returnPyInt_FromLong(_Py_RefTotal);}#endif /* Py_TRACE_REFS */PyDoc_STRVAR(getrefcount_doc,"getrefcount(object) -> integer\n\\n\Return the reference count of object. The count returned is generally\n\one higher than you might expect, because it includes the (temporary)\n\reference as an argument to getrefcount().");#ifdef COUNT_ALLOCSstaticPyObject*sys_getcounts(PyObject*self){externPyObject*get_counts(void);returnget_counts();}#endifPyDoc_STRVAR(getframe_doc,"_getframe([depth]) -> frameobject\n\\n\Return a frame object from the call stack. If optional integer depth is\n\given, return the frame object that many calls below the top of the stack.\n\If that is deeper than the call stack, ValueError is raised. The default\n\for depth is zero, returning the frame at the top of the call stack.\n\\n\This function should be used for internal and specialized\n\purposes only.");staticPyObject*sys_getframe(PyObject*self,PyObject*args){PyFrameObject*f=PyThreadState_Get()->frame;intdepth=-1;if(!PyArg_ParseTuple(args,"|i:_getframe",&depth))returnNULL;while(depth>0&&f!=NULL){f=f->f_back;--depth;}if(f==NULL){PyErr_SetString(PyExc_ValueError,"call stack is not deep enough");returnNULL;}Py_INCREF(f);return(PyObject*)f;}PyDoc_STRVAR(call_tracing_doc,"call_tracing(func, args) -> object\n\\n\Call func(*args), while tracing is enabled. The tracing state is\n\saved, and restored afterwards. This is intended to be called from\n\a debugger from a checkpoint, to recursively debug some other code.");staticPyObject*sys_call_tracing(PyObject*self,PyObject*args){PyObject*func,*funcargs;if(!PyArg_ParseTuple(args,"OO:call_tracing",&func,&funcargs))returnNULL;return_PyEval_CallTracing(func,funcargs);}PyDoc_STRVAR(callstats_doc,"callstats() -> tuple of integers\n\\n\Return a tuple of function call statistics, if CALL_PROFILE was defined\n\when Python was built. Otherwise, return None.\n\\n\When enabled, this function returns detailed, implementation-specific\n\details about the number of function calls executed. The return value is\n\a 11-tuple where the entries in the tuple are counts of:\n\0. all function calls\n\1. calls to PyFunction_Type objects\n\2. PyFunction calls that do not create an argument tuple\n\3. PyFunction calls that do not create an argument tuple\n\ and bypass PyEval_EvalCodeEx()\n\4. PyMethod calls\n\5. PyMethod calls on bound methods\n\6. PyType calls\n\7. PyCFunction calls\n\8. generator calls\n\9. All other calls\n\10. Number of stack pops performed by call_function()");#ifdef Py_TRACE_REFS/* Defined in objects.c because it uses static globals if that file */externPyObject*_Py_GetObjects(PyObject*,PyObject*);#endif#ifdef DYNAMIC_EXECUTION_PROFILE/* Defined in ceval.c because it uses static globals if that file */externPyObject*_Py_GetDXProfile(PyObject*,PyObject*);#endifstaticPyMethodDefsys_methods[]={/* Might as well keep this in alphabetic order */{"callstats",(PyCFunction)PyEval_GetCallStats,METH_NOARGS,callstats_doc},{"displayhook",sys_displayhook,METH_O,displayhook_doc},{"exc_info",sys_exc_info,METH_NOARGS,exc_info_doc},{"exc_clear",sys_exc_clear,METH_NOARGS,exc_clear_doc},{"excepthook",sys_excepthook,METH_VARARGS,excepthook_doc},{"exit",sys_exit,METH_VARARGS,exit_doc},#ifdef Py_USING_UNICODE{"getdefaultencoding",(PyCFunction)sys_getdefaultencoding,METH_NOARGS,getdefaultencoding_doc},#endif#ifdef HAVE_DLOPEN{"getdlopenflags",(PyCFunction)sys_getdlopenflags,METH_NOARGS,getdlopenflags_doc},#endif#ifdef COUNT_ALLOCS{"getcounts",(PyCFunction)sys_getcounts,METH_NOARGS},#endif#ifdef DYNAMIC_EXECUTION_PROFILE{"getdxp",_Py_GetDXProfile,METH_VARARGS},#endif#ifdef Py_USING_UNICODE{"getfilesystemencoding",(PyCFunction)sys_getfilesystemencoding,METH_NOARGS,getfilesystemencoding_doc},#endif#ifdef Py_TRACE_REFS{"getobjects",_Py_GetObjects,METH_VARARGS},#endif#ifdef Py_REF_DEBUG{"gettotalrefcount",(PyCFunction)sys_gettotalrefcount,METH_NOARGS},#endif{"getrefcount",(PyCFunction)sys_getrefcount,METH_O,getrefcount_doc},{"getrecursionlimit",(PyCFunction)sys_getrecursionlimit,METH_NOARGS,getrecursionlimit_doc},{"_getframe",sys_getframe,METH_VARARGS,getframe_doc},#ifdef MS_WINDOWS{"getwindowsversion",(PyCFunction)sys_getwindowsversion,METH_NOARGS,getwindowsversion_doc},#endif /* MS_WINDOWS */#ifdef USE_MALLOPT{"mdebug",sys_mdebug,METH_VARARGS},#endif#ifdef Py_USING_UNICODE{"setdefaultencoding",sys_setdefaultencoding,METH_VARARGS,setdefaultencoding_doc},#endif{"setcheckinterval",sys_setcheckinterval,METH_VARARGS,setcheckinterval_doc},{"getcheckinterval",sys_getcheckinterval,METH_NOARGS,getcheckinterval_doc},#ifdef HAVE_DLOPEN{"setdlopenflags",sys_setdlopenflags,METH_VARARGS,setdlopenflags_doc},#endif{"setprofile",sys_setprofile,METH_O,setprofile_doc},{"setrecursionlimit",sys_setrecursionlimit,METH_VARARGS,setrecursionlimit_doc},{"settrace",sys_settrace,METH_O,settrace_doc},{"call_tracing",sys_call_tracing,METH_VARARGS,call_tracing_doc},{NULL,NULL}/* sentinel */};staticPyObject*list_builtin_module_names(void){PyObject*list=PyList_New(0);inti;if(list==NULL)returnNULL;for(i=0;PyImport_Inittab[i].name!=NULL;i++){PyObject*name=PyString_FromString(PyImport_Inittab[i].name);if(name==NULL)break;PyList_Append(list,name);Py_DECREF(name);}if(PyList_Sort(list)!=0){Py_DECREF(list);list=NULL;}if(list){PyObject*v=PyList_AsTuple(list);Py_DECREF(list);list=v;}returnlist;}staticPyObject*warnoptions=NULL;voidPySys_ResetWarnOptions(void){if(warnoptions==NULL||!PyList_Check(warnoptions))return;PyList_SetSlice(warnoptions,0,PyList_GET_SIZE(warnoptions),NULL);}voidPySys_AddWarnOption(char*s){PyObject*str;if(warnoptions==NULL||!PyList_Check(warnoptions)){Py_XDECREF(warnoptions);warnoptions=PyList_New(0);if(warnoptions==NULL)return;}str=PyString_FromString(s);if(str!=NULL){PyList_Append(warnoptions,str);Py_DECREF(str);}}/* XXX This doc string is too long to be a single string literal in VC++ 5.0. Two literals concatenated works just fine. If you have a K&R compiler or other abomination that however *does* understand longer strings, get rid of the !!! comment in the middle and the quotes that surround it. */PyDoc_VAR(sys_doc)=PyDoc_STR("This module provides access to some objects used or maintained by the\n\interpreter and to functions that interact strongly with the interpreter.\n\\n\Dynamic objects:\n\\n\argv -- command line arguments; argv[0] is the script pathname if known\n\path -- module search path; path[0] is the script directory, else ''\n\modules -- dictionary of loaded modules\n\\n\displayhook -- called to show results in an interactive session\n\excepthook -- called to handle any uncaught exception other than SystemExit\n\ To customize printing in an interactive session or to install a custom\n\ top-level exception handler, assign other functions to replace these.\n\\n\exitfunc -- if sys.exitfunc exists, this routine is called when Python exits\n\ Assigning to sys.exitfunc is deprecated; use the atexit module instead.\n\\n\stdin -- standard input file object; used by raw_input() and input()\n\stdout -- standard output file object; used by the print statement\n\stderr -- standard error object; used for error messages\n\ By assigning other file objects (or objects that behave like files)\n\ to these, it is possible to redirect all of the interpreter's I/O.\n\\n\last_type -- type of last uncaught exception\n\last_value -- value of last uncaught exception\n\last_traceback -- traceback of last uncaught exception\n\ These three are only available in an interactive session after a\n\ traceback has been printed.\n\\n\exc_type -- type of exception currently being handled\n\exc_value -- value of exception currently being handled\n\exc_traceback -- traceback of exception currently being handled\n\ The function exc_info() should be used instead of these three,\n\ because it is thread-safe.\n\")/* concatenating string here */PyDoc_STR("\n\Static objects:\n\\n\maxint -- the largest supported integer (the smallest is -maxint-1)\n\maxunicode -- the largest supported character\n\builtin_module_names -- tuple of module names built into this interpreter\n\version -- the version of this interpreter as a string\n\version_info -- version information as a tuple\n\hexversion -- version information encoded as a single integer\n\copyright -- copyright notice pertaining to this interpreter\n\platform -- platform identifier\n\executable -- pathname of this Python interpreter\n\prefix -- prefix used to find the Python library\n\exec_prefix -- prefix used to find the machine-specific Python library\n\")#ifdef MS_WINDOWS/* concatenating string here */PyDoc_STR("dllhandle -- [Windows only] integer handle of the Python DLL\n\winver -- [Windows only] version number of the Python DLL\n\")#endif /* MS_WINDOWS */PyDoc_STR("__stdin__ -- the original stdin; don't touch!\n\__stdout__ -- the original stdout; don't touch!\n\__stderr__ -- the original stderr; don't touch!\n\__displayhook__ -- the original displayhook; don't touch!\n\__excepthook__ -- the original excepthook; don't touch!\n\\n\Functions:\n\\n\displayhook() -- print an object to the screen, and save it in __builtin__._\n\excepthook() -- print an exception and its traceback to sys.stderr\n\exc_info() -- return thread-safe information about the current exception\n\exc_clear() -- clear the exception state for the current thread\n\exit() -- exit the interpreter by raising SystemExit\n\getdlopenflags() -- returns flags to be used for dlopen() calls\n\getrefcount() -- return the reference count for an object (plus one :-)\n\getrecursionlimit() -- return the max recursion depth for the interpreter\n\setcheckinterval() -- control how often the interpreter checks for events\n\setdlopenflags() -- set the flags to be used for dlopen() calls\n\setprofile() -- set the global profiling function\n\setrecursionlimit() -- set the max recursion depth for the interpreter\n\settrace() -- set the global debug tracing function\n\")/* end of sys_doc */;PyObject*_PySys_Init(void){PyObject*m,*v,*sysdict;PyObject*sysin,*sysout,*syserr;char*s;#ifdef MS_WINDOWScharbuf[10];#endif#if defined(HAVE_LANGINFO_H) && defined(CODESET)char*oldloc,*codeset;#endifm=Py_InitModule3("sys",sys_methods,sys_doc);sysdict=PyModule_GetDict(m);sysin=PyFile_FromFile(stdin,"<stdin>","r",NULL);sysout=PyFile_FromFile(stdout,"<stdout>","w",NULL);syserr=PyFile_FromFile(stderr,"<stderr>","w",NULL);if(PyErr_Occurred())returnNULL;#ifdef MS_WINDOWSif(isatty(_fileno(stdin))){sprintf(buf,"cp%d",GetConsoleCP());if(!PyFile_SetEncoding(sysin,buf))returnNULL;}if(isatty(_fileno(stdout))){sprintf(buf,"cp%d",GetConsoleOutputCP());if(!PyFile_SetEncoding(sysout,buf))returnNULL;}#endif#if defined(HAVE_LANGINFO_H) && defined(CODESET)oldloc=setlocale(LC_CTYPE,0);setlocale(LC_CTYPE,"");codeset=nl_langinfo(CODESET);setlocale(LC_CTYPE,oldloc);if(codeset&&isatty(fileno(stdin))){if(!PyFile_SetEncoding(sysin,codeset))returnNULL;}if(codeset&&isatty(fileno(stdout))){if(!PyFile_SetEncoding(sysout,codeset))returnNULL;}#endifPyDict_SetItemString(sysdict,"stdin",sysin);PyDict_SetItemString(sysdict,"stdout",sysout);PyDict_SetItemString(sysdict,"stderr",syserr);/* Make backup copies for cleanup */PyDict_SetItemString(sysdict,"__stdin__",sysin);PyDict_SetItemString(sysdict,"__stdout__",sysout);PyDict_SetItemString(sysdict,"__stderr__",syserr);PyDict_SetItemString(sysdict,"__displayhook__",PyDict_GetItemString(sysdict,"displayhook"));PyDict_SetItemString(sysdict,"__excepthook__",PyDict_GetItemString(sysdict,"excepthook"));Py_XDECREF(sysin);Py_XDECREF(sysout);Py_XDECREF(syserr);PyDict_SetItemString(sysdict,"version",v=PyString_FromString(Py_GetVersion()));Py_XDECREF(v);PyDict_SetItemString(sysdict,"hexversion",v=PyInt_FromLong(PY_VERSION_HEX));Py_XDECREF(v);/* * These release level checks are mutually exclusive and cover * the field, so don't get too fancy with the pre-processor! */#if PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_ALPHAs="alpha";#elif PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_BETAs="beta";#elif PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_GAMMAs="candidate";#elif PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_FINALs="final";#endifPyDict_SetItemString(sysdict,"version_info",v=Py_BuildValue("iiisi",PY_MAJOR_VERSION,PY_MINOR_VERSION,PY_MICRO_VERSION,s,PY_RELEASE_SERIAL));Py_XDECREF(v);PyDict_SetItemString(sysdict,"api_version",v=PyInt_FromLong(PYTHON_API_VERSION));Py_XDECREF(v);PyDict_SetItemString(sysdict,"copyright",v=PyString_FromString(Py_GetCopyright()));Py_XDECREF(v);PyDict_SetItemString(sysdict,"platform",v=PyString_FromString(Py_GetPlatform()));Py_XDECREF(v);PyDict_SetItemString(sysdict,"executable",v=PyString_FromString(Py_GetProgramFullPath()));Py_XDECREF(v);PyDict_SetItemString(sysdict,"prefix",v=PyString_FromString(Py_GetPrefix()));Py_XDECREF(v);PyDict_SetItemString(sysdict,"exec_prefix",v=PyString_FromString(Py_GetExecPrefix()));Py_XDECREF(v);PyDict_SetItemString(sysdict,"maxint",v=PyInt_FromLong(PyInt_GetMax()));Py_XDECREF(v);#ifdef Py_USING_UNICODEPyDict_SetItemString(sysdict,"maxunicode",v=PyInt_FromLong(PyUnicode_GetMax()));Py_XDECREF(v);#endifPyDict_SetItemString(sysdict,"builtin_module_names",v=list_builtin_module_names());Py_XDECREF(v);{/* Assumes that longs are at least 2 bytes long. Should be safe! */unsignedlongnumber=1;char*value;s=(char*)&number;if(s[0]==0)value="big";elsevalue="little";PyDict_SetItemString(sysdict,"byteorder",v=PyString_FromString(value));Py_XDECREF(v);}#ifdef MS_COREDLLPyDict_SetItemString(sysdict,"dllhandle",v=PyLong_FromVoidPtr(PyWin_DLLhModule));Py_XDECREF(v);PyDict_SetItemString(sysdict,"winver",v=PyString_FromString(PyWin_DLLVersionString));Py_XDECREF(v);#endifif(warnoptions==NULL){warnoptions=PyList_New(0);}else{Py_INCREF(warnoptions);}if(warnoptions!=NULL){PyDict_SetItemString(sysdict,"warnoptions",warnoptions);}if(PyErr_Occurred())returnNULL;returnm;}staticPyObject*makepathobject(char*path,intdelim){inti,n;char*p;PyObject*v,*w;n=1;p=path;while((p=strchr(p,delim))!=NULL){n++;p++;}v=PyList_New(n);if(v==NULL)returnNULL;for(i=0;;i++){p=strchr(path,delim);if(p==NULL)p=strchr(path,'\0');/* End of string */w=PyString_FromStringAndSize(path,(int)(p-path));if(w==NULL){Py_DECREF(v);returnNULL;}PyList_SetItem(v,i,w);if(*p=='\0')break;path=p+1;}returnv;}voidPySys_SetPath(char*path){PyObject*v;if((v=makepathobject(path,DELIM))==NULL)Py_FatalError("can't create sys.path");if(PySys_SetObject("path",v)!=0)Py_FatalError("can't assign sys.path");Py_DECREF(v);}staticPyObject*makeargvobject(intargc,char**argv){PyObject*av;if(argc<=0||argv==NULL){/* Ensure at least one (empty) argument is seen */staticchar*empty_argv[1]={""};argv=empty_argv;argc=1;}av=PyList_New(argc);if(av!=NULL){inti;for(i=0;i<argc;i++){#ifdef __VMSPyObject*v;/* argv[0] is the script pathname if known */if(i==0){char*fn=decc$translate_vms(argv[0]);if((fn==(char*)0)||fn==(char*)-1)v=PyString_FromString(argv[0]);elsev=PyString_FromString(decc$translate_vms(argv[0]));}elsev=PyString_FromString(argv[i]);#elsePyObject*v=PyString_FromString(argv[i]);#endifif(v==NULL){Py_DECREF(av);av=NULL;break;}PyList_SetItem(av,i,v);}}returnav;}voidPySys_SetArgv(intargc,char**argv){#if defined(HAVE_REALPATH)charfullpath[MAXPATHLEN];#elif defined(MS_WINDOWS)charfullpath[MAX_PATH];#endifPyObject*av=makeargvobject(argc,argv);PyObject*path=PySys_GetObject("path");if(av==NULL)Py_FatalError("no mem for sys.argv");if(PySys_SetObject("argv",av)!=0)Py_FatalError("can't assign sys.argv");if(path!=NULL){char*argv0=argv[0];char*p=NULL;intn=0;PyObject*a;#ifdef HAVE_READLINKcharlink[MAXPATHLEN+1];charargv0copy[2*MAXPATHLEN+1];intnr=0;if(argc>0&&argv0!=NULL)nr=readlink(argv0,link,MAXPATHLEN);if(nr>0){/* It's a symlink */link[nr]='\0';if(link[0]==SEP)argv0=link;/* Link to absolute path */elseif(strchr(link,SEP)==NULL);/* Link without path */else{/* Must join(dirname(argv0), link) */char*q=strrchr(argv0,SEP);if(q==NULL)argv0=link;/* argv0 without path */else{/* Must make a copy */strcpy(argv0copy,argv0);q=strrchr(argv0copy,SEP);strcpy(q+1,link);argv0=argv0copy;}}}#endif /* HAVE_READLINK */#if SEP == '\\' /* Special case for MS filename syntax */if(argc>0&&argv0!=NULL){char*q;#ifdef MS_WINDOWSchar*ptemp;if(GetFullPathName(argv0,sizeof(fullpath),fullpath,&ptemp)){argv0=fullpath;}#endifp=strrchr(argv0,SEP);/* Test for alternate separator */q=strrchr(p?p:argv0,'/');if(q!=NULL)p=q;if(p!=NULL){n=p+1-argv0;if(n>1&&p[-1]!=':')n--;/* Drop trailing separator */}}#else /* All other filename syntaxes */if(argc>0&&argv0!=NULL){#if defined(HAVE_REALPATH)if(realpath(argv0,fullpath)){argv0=fullpath;}#endifp=strrchr(argv0,SEP);}if(p!=NULL){#ifndef RISCOSn=p+1-argv0;#else /* don't include trailing separator */n=p-argv0;#endif /* RISCOS */#if SEP == '/' /* Special case for Unix filename syntax */if(n>1)n--;/* Drop trailing separator */#endif /* Unix */}#endif /* All others */a=PyString_FromStringAndSize(argv0,n);if(a==NULL)Py_FatalError("no mem for sys.path insertion");if(PyList_Insert(path,0,a)<0)Py_FatalError("sys.path.insert(0) failed");Py_DECREF(a);}Py_DECREF(av);}/* APIs to write to sys.stdout or sys.stderr using a printf-like interface. Adapted from code submitted by Just van Rossum. PySys_WriteStdout(format, ...) PySys_WriteStderr(format, ...) The first function writes to sys.stdout; the second to sys.stderr. When there is a problem, they write to the real (C level) stdout or stderr; no exceptions are raised. Both take a printf-style format string as their first argument followed by a variable length argument list determined by the format string. *** WARNING *** The format should limit the total size of the formatted output string to 1000 bytes. In particular, this means that no unrestricted "%s" formats should occur; these should be limited using "%.<N>s where <N> is a decimal number calculated so that <N> plus the maximum size of other formatted text does not exceed 1000 bytes. Also watch out for "%f", which can print hundreds of digits for very large numbers. */staticvoidmywrite(char*name,FILE*fp,constchar*format,va_listva){PyObject*file;PyObject*error_type,*error_value,*error_traceback;PyErr_Fetch(&error_type,&error_value,&error_traceback);file=PySys_GetObject(name);if(file==NULL||PyFile_AsFile(file)==fp)vfprintf(fp,format,va);else{charbuffer[1001];constintwritten=PyOS_vsnprintf(buffer,sizeof(buffer),format,va);if(PyFile_WriteString(buffer,file)!=0){PyErr_Clear();fputs(buffer,fp);}if(written<0||written>=sizeof(buffer)){constchar*truncated="... truncated";if(PyFile_WriteString(truncated,file)!=0){PyErr_Clear();fputs(truncated,fp);}}}PyErr_Restore(error_type,error_value,error_traceback);}voidPySys_WriteStdout(constchar*format,...){va_listva;va_start(va,format);mywrite("stdout",stdout,format,va);va_end(va);}voidPySys_WriteStderr(constchar*format,...){va_listva;va_start(va,format);mywrite("stderr",stderr,format,va);va_end(va);}